Last Updated
：2025/11/29
keyhole urchin
Noun
Japanese Meaning
鍵穴ウニ：Melitta属、Rotula属、Encope属に属し、平らな体に鍵穴のような穴が一つ以上ある海ウニ（砂ドル）の総称。
（ plural ）
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Any of numerous clypeastroid sea urchins (sand dollars) of the genera Melitta, Rotula and Encope, with one or more perforations resembling keyholes.
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keyhole urchin
While walking along the beach, I found a delicate keyhole urchin washed up among the seaweed.
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While walking along the beach, I found a delicate keyhole urchin washed up among the seaweed.
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